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Stock Market 9 February 2026
Micron shares ended Thursday at $1,133.99, up 8.7%, and gained 15.5% over the holiday-shortened week, with attention turning to upcoming earnings that will test the AI memory rally. Amkor Technology rose 4.7% to $90.46 after TSMC signed a 10-year deal for advanced packaging and testing in Arizona. Rocket Lab closed at $107.24, down 0.69% for the day but up 4.7% for the week after an analyst upgrade and index inclusion. Marvell ended at $310.58, up 7.27%, and is set to join the S&P 500, with KeyBanc raising its price target to $385. IonQ closed at $56.55, up 3.4% for the session but down 2.2% for the week. The S&P 500 rose 0.93%, Nasdaq 2.43%, and Dow 0.71% for the week, with semiconductor stocks rebounding; Intel surged 10.6% after news of a partnership with Apple for U.S. chip design and manufacturing. Teradyne finished at $437.92, up 7.19% for the day and 8.6% for the week, and will join the Nasdaq-100. Sandisk closed at $2,184.75, up 11.54%, with the Philadelphia semiconductor index up 7% for the week. Astera Labs ended at $417.07, up 11.31% for the day and 13.6% for the week, and will also join the Nasdaq-100. Nebius closed at $286.69, up 2.06%, and will be added to the Nasdaq-100 along with CoreWeave. Vertiv finished at $333.05, up 4.87% for the day and nearly 10% for the week, driven by AI data-center cooling demand.